GBH C Lotion is a topical pharmaceutical formulation containing Lindane 1% w/v and Cetrimide 0.1% w/v, indicated for the treatment of ectoparasitic infestations such as scabies and pediculosis. Lindane, an organochlorine compound, exhibits potent pediculicidal and scabicidal activity by interfering with the nervous system of parasites, leading to paralysis and death. Cetrimide, a quaternary ammonium antiseptic, provides additional antimicrobial action, reducing the risk of secondary bacterial infections commonly associated with skin infestations. GBH C Lotion is applied externally to affected areas, ensuring thorough coverage to eradicate mites and lice effectively. The lotion base facilitates ease of application and absorption while maintaining skin hydration. It is recommended for use in patients who have not responded to or are intolerant of first-line treatments. Caution is advised in individuals with hypersensitivity to any component, and the product should be used according to prescribed guidelines to minimize potential neurotoxicity associated with Lindane. Avoid contact with eyes and mucous membranes. GBH C Lotion is contraindicated in infants, pregnant or lactating women due to systemic absorption risks. Proper application and adherence to treatment duration are essential for optimal therapeutic outcomes and prevention of reinfestation.